ModsFinder

Xp Bottle Optimizer

by cutebow

XP Bottle Optimizer shows thrown experience bottles on the client at once, so they feel responsive before the server confirms them.

FabricClient-side onlyAll rights reserved1.21 – 1.21.11

What it does

When a player throws an XP bottle, the client draws the bottle immediately instead of waiting for the server to send it back. This reduces the visible delay on servers with higher ping. The server still decides the real outcome: experience drops, inventory use and cooldowns all follow server rules, and the bottle's actual behavior is unchanged.

The optimizer also reduces duplicate throw sounds. The sound plays once for the predicted client-side throw, and the server's sound is held back so the effect is not doubled. Servers can opt out, and when they do the optimizer turns itself off for that connection. The mod works across the 1.21 range, and the same jar covers 1.21.X builds up to 1.21.11.

Key features

  1. Instant client-side bottles

    Thrown XP bottles appear on the client as soon as they are thrown, without waiting for the server's copy.

  2. Single throw sound

    The predicted throw plays one sound, and the duplicate sound from the server is suppressed.

  3. Visual-only changes

    The optimizer changes only how the throw looks and feels, leaving XP amounts and bottle physics on the server unchanged.

Compatibility

Latest build for each game version and loader.

1.21.x12 of 12 versions with builds
1.21.111.0.0+1.21.X
1.21.101.0.0+1.21.X
1.21.91.0.0+1.21.X
1.21.81.0.0+1.21.X
1.21.71.0.0+1.21.X
1.21.61.0.0+1.21.X
1.21.51.0.0+1.21.X
1.21.41.0.0+1.21.X
1.21.31.0.0+1.21.X
1.21.21.0.0+1.21.X
1.21.11.0.0+1.21.X
1.211.0.0+1.21.X
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Use cases

High-ping multiplayer

Players on servers with noticeable latency see their bottles land and react without the usual lag before the throw appears.

Who it’s for: Players on Fabric who throw XP bottles often on multiplayer servers, especially those with higher ping. Single-player players gain little, since the delay the mod removes comes from the network.

How it compares

Full comparison

Potion Optimizer is a Fabric mod for 1.21.11 with the same client-side only environment, released under All rights reserved and not open source. Sword Optimizer is a client-side Fabric mod for 1.21.9 – 1.21.11 under the MIT License, but it targets swords, not XP bottles. Sign Optimizer covers 1.21.8 – 1.21.11 on Fabric as a client-side mod, released under All rights reserved, and it works on signs rather than thrown items.

ModLoadersGame versionsEnvironmentUpdated
Xp Bottle OptimizerFabric1.21 – 1.21.11Client-side only2026-05-30
Potion OptimizerFabric1.21.11Client-side only2026-03-31
Sword OptimizerFabric1.21.9 – 1.21.11Client-side only2026-05-24
Sign OptimizerFabric1.21.8 – 1.21.11Client-side only2026-01-16

Questions

Does XP Bottle Optimizer need to be installed on the server?

No. Players add it to their own game, and a server needs no copy. A server can still opt out, and the optimizer then switches itself off for that connection.

Does the mod change how much XP a bottle gives?

No. The server keeps control of XP drops, inventory use and cooldowns. The optimizer only affects the visual responsiveness of the throw.

Which game versions does XP Bottle Optimizer support?

The mod has Fabric files for 1.21 – 1.21.11, and the latest file is 1.0.0+1.21.X for 1.21.11.

In the catalog

Xp Bottle Optimizer is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 19,862 mods support Minecraft 1.21.11.

Optimization mods3,545Fabric modsMods for 1.21.1119,862

More from cutebow

All projects
Anchor Optimizer1.21 – 26.3Silicon1.21 – 26.3CreamyKeys1.8.9 – 26.3Client Side Crystals1.21 – 26.3Hover Items1.20 – 26.3Borderless Windowed Vulkan1.21 – 26.3

Similar mods

Sodium1.16.3 – 26.3Iris Shaders1.16.5 – 26.3Entity Cullingb1.7.3 – 26.3FerriteCore1.16.5 – 26.3ImmediatelyFast1.18.2 – 26.3Sodium Extra1.16.2 – 26.3

What the author says

Makes XP bottles feel more instant and responsive on the client side. When throwing XP bottles on servers, the bottle can feel delayed because your client has to wait for the server bottle to appear first.
cutebow, on the Modrinth page

Official listing

Owner
cutebow
Published
2026-05-30
Updated on Modrinth
2026-05-30
Facts verified
2026-10-15

Tags

DecorationEquipmentOptimization
Open on ModrinthCompare